IconVault's Scientific Calculator is a full-featured calculator with trigonometric functions (sin, cos, tan and inverses), logarithms (log and natural log), powers and roots, factorials, permutations and combinations, and constants like pi and e. A DEG/RAD toggle, a scrollable history tape and full keyboard support make it genuinely usable for real work.

Everything runs 100% in your browser, so it works offline after loading and your calculations never leave the page. It is free with no signup. The honest note: it is a browser tool, not a certified exam calculator, so check your exam's rules before relying on it for a test. For homework, physics, chemistry and engineering, it is ready.